Quantitative model for the kinetics of lyotropic phase transitions involving changes in monolayer curvature

Quantitative model for the kinetics of lyotropic phase transitions involving changes in monolayer curvature
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涉及单层曲率变化的溶致相变动力学的定量模型

DOI:
10.1039/b911762h
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发表时间:
2009
期刊:
影响因子:
3.4
通讯作者:
Squires A
Squires A
中科院分区:
化学2区
文献类型:
--
作者:
Squires A

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我们提出了一个动力学模型之间的转换不同的自组装脂质结构。该模型显示了不同几何形状的中间相之间的相变速率的数据可以用来提供有关转换机制和过渡态的信息。例如,这可以用于深入了解细胞膜分裂或融合中的中间结构。在单层曲率从初始到最终中间相变化的情况下,我们认为相变主要是由松弛曲率随压力或温度的变化驱动的,这改变了两个中间相结构的相对曲率弹性能。使用这个模型,我们已经分析了先前发表的动力学数据的相互转换的反双连续立方相的1-单油酸甘油酯-30重量%的水系统。数据是QIIG和QIID阶段之间的过渡,我们的分析表明,过渡状态更接近QIID比QIIG阶段。使用QIIG和QIID相的单层平均曲率的估计值分别为−0.123 nm−1和−0.133 nm−1,得到过渡态的单层平均曲率值在−0.131 nm−1和−0.132 nm−1之间。此外,我们估计几千个分子在一个“合作单位”内合作进行相变,相当于QIIG的1-2个单位晶胞或QIID的4-10个单位晶胞。
We present a kinetic model for transformations between different self-assembled lipid structures. The model shows how data on the rates of phase transitions between mesophases of different geometries can be used to provide information on the mechanisms of the transformations and the transition states involved. This can be used, for example, to gain an insight into intermediate structures in cell membrane fission or fusion. In cases where the monolayer curvature changes on going from the initial to the final mesophase, we consider the phase transition to be driven primarily by the change in the relaxed curvature with pressure or temperature, which alters the relative curvature elastic energies of the two mesophase structures. Using this model, we have analyzed previously published kinetic data on the inter-conversion of inverse bicontinuous cubic phases in the 1-monoolein–30 wt% water system. The data are for a transition between QIIG and QIID phases, and our analysis indicates that the transition state more closely resembles the QIID than the QIIG phase. Using estimated values for the monolayer mean curvatures of the QIIG and QIID phases of −0.123 nm−1 and −0.133 nm−1, respectively, gives values for the monolayer mean curvature of the transition state of between −0.131 nm−1 and −0.132 nm−1. Furthermore, we estimate that several thousand molecules undergo the phase transition cooperatively within one “cooperative unit”, equivalent to 1–2 unit cells of QIIG or 4–10 unit cells of QIID.
DOI: --
发表时间: 1998
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发表时间: 1998
影响因子: 3.3
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DOI: 10.1098/rsta.2006.1844
发表时间: 2006
期刊: Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
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作者:
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DOI: --
发表时间: 2000
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DOI: 10.1088/0953-8984/16/5/002
发表时间: 2004-02-11
影响因子: 2.7
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